https://bugs.kde.org/show_bug.cgi?id=452411
Bug ID: 452411
Summary: EPUB3 files by calibre not generating preview
Product: kio-extras
Version: 21.12.3
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Thumbnails and previews
Assignee: plasma-b...@kde.org
Reporter: hasez...@gmail.com
Target Milestone: ---
SUMMARY
I noticed that when upgrading (or just editing) books in calibre, they somehow
lose the ability to have a thumbnail (in dolphin) generated and are just the
generic file attribute cover for a ".epub" file
STEPS TO REPRODUCE
1. have a EPUB(2) file that has a cover *before* adding to calibre
2. import original EPUB file into calibre (any latest version)
3. open "Edit book" in calibre on the imported epub
4. select "Tools -> Upgrade book internals" to upgrade the file to EPUB3
5. save the edited book
6. go to the directory where the file is (in the calibre library), in my case
with dolphin
7. observe not having a cover
OBSERVED RESULT
Generic file attribute thumbnail for edited file in calibre
EXPECTED RESULT
Thumbnail from the EPUB cover
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.24.3
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.3
Kernel Version: 5.16.14-1-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7700K CPU @ 4.20GHz
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX Vega
ADDITIONAL INFORMATION
The most consistent way to reproduce this problem is to have a EPUB2 file
upgraded to a EPUB3 file, but it also happens when applying other changes
(though i could not to consistently reproduce it with something else)
this issue might be similar to https://bugs.kde.org/show_bug.cgi?id=451226, but
that one seems to be fixed
in my case calibre is installed as a flatpak as version 5.40.0
from what i can tell from my testing, all EPUB3's that *dont* have "manifest ->
item -> cover -> properties="cover-image"" set, just work, all others that
either have that set or reference it with "metadata -> meta -> cover ->
content="cover-image"" (where "content="id"" is the id set in manifest) dont
work
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